Rainbow Electronics MAX767 - Manual (Page 2)

MAX767
5V-to-3.3V, Synchronous, Step-Down
Power-Supply Controller
2 _______________________________________________________________________________________
ABSOLUTE MAXIMUM RATINGS
Stresses beyond those listed under “Absolute Maximum Ratings” may cause permanent damage to the device. These are stress ratings only, and functional
operation of the device at these or any other conditions beyond those indicated in the operational sections of the specifications is not implied. Exposure to
absolute maximum rating conditions for extended periods may affect device reliability.
V CC to GND .................................................................-0.3V, +7V
PGND to GND ........................................................................±2V
BST to GND ...............................................................-0.3V, +15V
LX to BST.....................................................................-7V, +0.3V
Inputs/Outputs to GND
(ON, REF, SYNC, CS, FB, SS) .....................-0.3V, V CC + 0.3V
DL to PGND .....................................................-0.3V, V CC + 0.3V
DH to LX...........................................................-0.3V, BST + 0.3V
REF Short to GND.......................................................Momentary
REF Current.........................................................................20mA
Continuous Power Dissipation (T A = +70°C)
20-Pin SSOP (derate 8.00mW/°C above +70°C) ..........640mW
Operating Temperature Ranges:
MAX767CAP/MAX767_CAP.................................0°C to +70°C
MAX767EAP/MAX767_EAP ..............................-40°C to +85°C
Lead Temperature (soldering, 10s) .................................+300°C
PARAMETER
Oscillator Frequency
DH Sink/Source Current
MIN TYP MAX
1
260 300 340
UNITS
SS Source Current
A
2.50 4 6.5
(BST - LX) = 4.5V, DH = 2V
DL On Resistance
µA
Current-Limit Voltage
200
7
80 100 120 mV
V CC Fault Lockout Voltage
Ω
3.80 4.20
kHz
V
Line Regulation
High or low
0.1 %
Oscillator SYNC Range
SS Fault Sink Current
DH On Resistance
2 mA
7
3.24 3.30 3.36
Ω
240 350 kHz
SYNC High Pulse Width
V CC Standby Current
High or low, (BST - LX) = 4.5V
120 200
200
µA
V CC Quiescent Current
ns
0.7 1.0 mA
SYNC Low Pulse Width 200 ns
SYNC Rise/Fall Time
Output Voltage (FB)
200 ns
Oscillator Maximum Duty Cycle
V CC Input Supply Range
89 92
4.5 5.5 V
95
%
Input Low Voltage
3.17 3.35 3.46
V
0.8 V
Input High Voltage
2.40
3.32 3.50 3.60
V CC - 0.5
V
Input Current ±1 µA
DL Sink/Source Current 1 A
CONDITIONS
SYNC = 3.3V
SYNC = 0V or 5V
CS - FB
Falling edge, hysteresis = 1%
V CC = 4.5V to 5.5V
MAX767, MAX767R, MAX767S
ON = 0V, V CC = 5.5V
FB = CS = 3.5V
Not tested
SYNC = 3.3V
SYNC = 0V
SYNC, ON
ON
0mV < (CS - FB) < 80mV,
4.5V < V
CC < 5.5V
(includes load and
line regulation)
SYNC
SYNC, ON = 0V or 5V
DL = 2V
Load Regulation 2.5 % (CS - FB) = 0mV to 80mV
3.46 3.65 3.75
MAX767R
MAX767S
MAX767, MAX767T
ELECTRICAL CHARACTERISTICS
(V CC = ON = 5V, GND = PGND = SYNC = 0V, I REF = 0mA, T A = T MIN to T MAX , unless otherwise noted. Typical values are at T A = +25°C.)
Reference Voltage (REF)
3.26 3.30 3.34
V
MAX767T